My family buys this version and the capsule version of Nature's Way Echinacea Goldenseal. We get the liquid form for our children. Ever since we've used this in our home, we have not gotten the flu. Just recently in December the flu tried to attack our family and we all took continuous doses of this supplement, some motrin for any pain or fever, drank plenty of fluids, ate as much as we could, and the virus that was trying hard to attack us lost it's battle by the 5th day. It never got the chance to get what we call "fully blown". We just felt weaker with a cough during those days. :-)